diff --git a/packages/ketcher-core/src/domain/entities/Sugar.ts b/packages/ketcher-core/src/domain/entities/Sugar.ts
index e6b65fd78c..c497b70c20 100644
--- a/packages/ketcher-core/src/domain/entities/Sugar.ts
+++ b/packages/ketcher-core/src/domain/entities/Sugar.ts
@@ -74,6 +74,13 @@ export class Sugar extends BaseMonomer {
       return 'R2';
     }
 
+    if (
+      otherMonomer.isAttachmentPointExistAndFree('R2') &&
+      this.isAttachmentPointExistAndFree('R1')
+    ) {
+      return 'R1';
+    }
+
     if (
       !otherMonomer.isAttachmentPointExistAndFree('R1') &&
       this.isAttachmentPointExistAndFree('R1')